The Massasauga Provincial Park is a provincial park in Parry Sound District, Ontario, Canada, stretching from the town of Parry Sound south to the Moon River.
The park encompasses hundreds of islands on the coast of Georgian Bay and many inland lakes including Clear Lake and Spider Lake. Classified as a "Natural Environment" park, it contains no roads, so camping is limited to interior sites. The sites on the bay can be reached by motor boat whereas those on the lakes are typically reached by non-motorized craft such as canoes or kayaks. The park also has mooring anchors for boats to overnight in some inlets on Georgian Bay.
An interpretive trail is located on Wreck Island. A multi-day backpacking trail in the northern part of the park, the Nipissing-North Arm Orienteering Trail, is used for orienteering. This wilderness trail is uncleared and only minimally marked.
The park contains a striking landscape of windswept pines clinging to smooth granite-striped rocks, towering cliffs, narrow bays and inlets. On a typical visit to the park one might see wildlife common to the Near-North area of Ontario such as snapping turtles, loons, bears, great blue herons and otters but also wildlife typical of the great lakes such as cormorants, eagles, and ducks.
"Massasauga" means "mouth of the river" in Ojibwe. The name also refers to the massasauga rattlesnake, which is found in the area.